_________are the inactive toxic substances extracted from the bacteria.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes inactive toxic substances extracted from bacteria.

2. **Identifying the Term**: The term that fits this description is "toxoids." Toxoids are modified forms of toxins that have been rendered inactive.

3. **Explanation of Toxoids**: Toxoids are created through chemical modifications of the toxins produced by bacteria. While the original toxins are harmful, toxoids are inactive and do not cause disease.

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